When an error occurs in the execution of a call, Sd has an option
whereby it tries
to leave in place any concepts that were associated with that call.
That is, after displaying the error message, the program will behave
as though you had once again typed those concepts. The assumption here
is that only the call was mistaken, and you really wanted the concepts
and do not wish to have to enter them again. If you don't want those
concepts, you can remove them one by one with the undo command.
Or you can use the command discard entered concepts to get rid of
all of them at once.
The toggle retain after error command toggles
(turns on or off) the state of this option.
See section Changing Modes. It can also be turned on when the program begins,
either by giving a command-line option (see section Command-Line Options) or
through the use of the initialization file (see section Option Control).
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